EFS by trisomy status.

The 6-year EFS ± standard deviation was 93% ± 6% for both trisomies; 85% ± 17% for trisomy 10 without trisomy 17; 79% ± 18% for trisomy 17 without trisomy 10; and 80% ± 4% for no trisomy 10 or 17 (log rank P = .09 for difference among the 4 groups; P = .02 for both trisomies versus all others).